Rotary pump.



J. SCHNEIBLE.

ROTARY PUMP.

APPLICATION FILED 111111.11914A 1,1 16,851 Patented NW10, 1914.

'f f f 4 JOSEPH scIINEnsLE, or' cnIciieO, ILLINOIS. f k

ROTARY my.

To all whom it may concern e Be it known that 1, .JOSEPH SG'IINEIIILE, a citizen ofl the ,United States, residing at Chicago, the county of Cook and State of illinois, have invented .a new and useful' Improvement in Rotary Pumps, of which the lfollowing is a specification.

My invention relates to anv improvement in the class`\ ofrotar'y. pumps, wherein centrifugal oroeis generated to overcomelthe head .against which the pump operates.

In the acc )mpanying drawing, F' 1re 1 illustrates my invention in a preferre form of its .embodiment by a view in 'side elevation, with ,one head of the pump removed, the View showing parts in section and a part of the casing broken away to present the exit-port, shown in section; and Fig. 2 is la section on line 2, Fig. 1.

The pump-casing, .provided with feet through which to bolt it to a stable` foundation, is shown tobe formed of a head 3 hav.- ing a wall 4 extending from it to describe about its interior a complete true circle and form .the pump-chamber 5. VThis head has a central ,entrance-chamber 6 and affords 'a bearing for a rotatable shaft 7 Ato be' coupled, for driving it, to a suitable prime mover (not shown). A head 8, closing the chamber, is bolted to a flange. about the chamberwall and has a central hub-portion shown to be provided with a stuHing-box and affording another .bearingfor the shaft. On the shaft is secured arotor 9, Ashown to be composed of two opposite radially-ex` tending blades, though the number .thereof employed may exceed two if desired. Each blade 'is preferably formed of a plurality of .hard-rolled spring metal sheets laminated in successively increasing lengths and shown to be suitably secured at their inner ends (Fig. 1) to the opposite hub-members, which are bolted togethertoform a rigid hub .10,

' keyed to the shaftythe bolts passing lthrough the .blades near their inner ends to secure the metal'sheets inthe laminated relation in 'which they are clamped lbetween the hub.-

members. This construction of the rotor l e, by wey of .Pge )gading them-Mud" ,showllpb renders its blades, for-,the purpose hereine after explained, resiliently yielding toward their -tipends The -Huid to be plunged en-y ters thecha/mber through the entranceport at in' Fig. lj and speemee'uen Lettere raten. appneevtien nea Meren a, i914. serial I Io. 822,111.

f guiding the eetrenee ef the 'seid inthe direction of rotation of the rotor. In practice of the. suction-inlet 11 serving to convey thedesired quantity of. fluid to the pump (at mately 3--4feet er second in the .case .of Water). It is pre erred to provide only one exit-port 12, as shown, centrally in the wall 4. The port may' be of any desired sectional shape, though the shape of the throat found circular'surface of the pump-chamber, the extent of elongation ofthe .oval depending leads from -the pump-chamber. The area enlarges outwardly toward the connecting part for the delivery pipe at its outer .end,

pumped, to give a velocity of to @7 5 per pump is operating under normal conditions. In operation, the speed of the radial out of the revolving rotor is materially reduced ftips; .and the fluid which cfills the .annular space between the circle described by the extremities .of the -rotor-tips and the truly circular inner periphery of -the casing, isberadial pressureof the fluid which is being produced and maintained .by the rotor in the ing thelvfluid --from the pump-chamber through the exit-port 12, therefore, is that duced, as gheretofore, by converting velocityforce into pressure asthe .iuidleaves .the impeller. lThe ,area of the throat of the exitport should beless than the radial cross-sec- M'Orwver., the' serenity 01E-the Pump-chamber isygeuch .as to cause the ratemofradial flaw @bemin to consfenflrdscremin the outward direction, s@ that the transition 0f ...111er eresie., .take rlawitiiut eddy- Ais .calculated,'for water as .the .fluid to .be

' Patented Nov.t1o,191i. t

it is found desirable to constructthe width of the rotor tips to conform to the diameter .a .normal rate of speed, .which is approxi` Vin practice to be the most desirable is round, u which shape shows as an oval at the inneron the angle of declination at which the port of .the Lthroat of theiexit-port, from which it cent. of the rotor-tip velocity when theA ward movement of the fluidlunder the action in its .course from the intake to .the rotor-- youd the rotating action of the blades, and l is revolvedby its own lmomentum while be ing at Athe same time subjected toa Iconstant pump-chamber. The pressure for discharg, 1

,produced by centrifugal and velocity force within .the chamber,-.1nstead of being protional area of the annular space, .as shown.'

. currents, and being thence revolved within a perfectly circular guidance, the peripheralyvelocity momentum of the slowly outwardly moving fluid is practically maintained. As will be understood, the pressure in the pump-chamber being radial-and the velocrotor-tips andthe inner circular circumference of the pump-chamber aords a s pecies of reservoir for a supply of the fluid under pressure, whichv pressure 1s malntainecl throughout the operation by the constriction of the pump-chamber should tally affect the the labnormal in the exit-port 12 which causes the discharging fluid to ow uniformly and smoothly and without impingement within it. The ressure at the throat, because of the veloclty there, is less than at the 'nletend, so4 that the loss of pressure 1s, acc rdiiig to the well-known Venturi theory, substan tially regained at the outlet end of the discharge-port, due to vthe decrease of velocity after the water passes the-throat.

Where a rigid rotor is used in my improved pump, the space referred to between the circle described by the extremities. of the rotor-tips' and the innercircular periphery be suiiiciently large to prevent eddy currents. When, however, the rotor-blades are resiliently vielding, as described, the tips will automatically adjust themselves to the discharge condition, and this space may be normally relatively small. These blades are sulficiently rigid, throughout their length, to resist-flexing in overcoming the load within lthe pump-chamber when the pump is operatingundery normal conditions. ShouldV the normal head.against which the pump is working'be lowered, however, as by drawing off from a lower point in the line of discharge, causing the quantity of fluid passing through the 'pump to increase, the rotor withuinflexible blades would increase the power-consumption and might detrimen- 1pumping eiciefncy.. With the .resiliently-b aded rotor in use under these conditions, the blades will adjust themselves thereto by flexing backw rdly under discharge-con it-ions 4and thereby increase the capacity of the aforesaid annular space by radially shortening theirotor-blades and prevent 'eddy-currents, butl 'as the higher head is restored, the normal centrifugal force within the pum chamber is regained `and the blades wil straighten and operate the pump to deliver theftlid against the normal head.' As will j be-isemthe flexible rotor-blades are capable lofltlus' automatically adjusting themselves thiofgliout:a` considerable range of variation wardly,l by narrowing the circle ythrough which the tip-extremities travel, which occurs Whenever an excessive quantity of fluid is discharging through the contracted exit- .port 12.

The gist of thel invention'lies inY allowing the annular space between the 'circle described by the extremities of the revolving roferential inner surface of the pump-chamber, whereby radial pressure generated in the pump is supplied and maintained on the fluid while it is discharging through the throat of the exit-port, theL construction of which tends to convert the velocity with which the fluid passes through the throat into pressure in the expanding section beyond the throat leading to the dischargeconduit (not shown) from the pump. While the cross-section and area of the exit-port may be changed to'suit conditions of construction or the physicallcondition of the fluid to be pumped, the governing features tor-tips and/ the completely circular circum to be observed for the best results are the area of the throat of the port with relation to the quantity of the fluid discharged, and the angle at which the port inclines downwardly from-the pump-chamber. The rotating member, which I term a rotor in preference to an impeller, because it, does not directly impel the fluid out of the exit-port but performs the sole function of revolving the' fluid within the pump-chamber to set up and maintain centrifugal pressure in the annular space about the circle described by the extremities of the revolving blade-tips, should be of slender construction to displace as little as possible of the fluid revolved in the pump-chamber, and offer the minimum ofresistance to the Huid since, inasmuch asl the rotor-blades rev'olve in a medium in which centrifugal force is maintained, the tangential stresses which the blades have to overcome are, at least mainly., those due to rota-ting the fluid passing through the pump-chamber and to friction.

From the foregoing description of my pump, its distinguishing characteristics will eunderstood to'be the following: Maintenance of centrifugal pressure in the pump- ...chamber on the body of Huid rotated. therei specically shown andggscribed, and I` do not intend by illustrating agngle; specc.

or preferred embodiment of my invention to be imited thereto my intention being in the followin claims to claim protection upon all the nove ty there may be 1n my invention as i provided with a completely circular internal periphery and a peripheral inclining exit-port provided with a throat at its inner end, and means cooperating with saidport to produce and maintainl outward radial and gradually diminishing flow of fluid in the pump-chamber and .outward radial and gradually increasing pressure thereof in said chamber for discharging the iuid from the annular space adjacent to said periphery. I

2. A'rotary pump comprising a casing containing\ the pump-chamber having a completely\circ u1ar internal periphery, an entrance-port and a peripheral. inclining exit-port enlar `ng outwardly from an inner throat'sectlon, and a rotor Yrevolubly supported in the chamber .te generate by revolving therein radial pressure of the fluid against .which it operates and forming with said periphery about the circle in which the tip extremity of the rotor revolves, an annular space for fluid exposed to said radial pressure.

3. A rotary pump comprising a chamber having a completely circular internal periphery, a rotor having a diameter less than that of said periphery and supported to revolve concentrically within said chamber and forming an annular space between said periphery and the circle in which the tipextremities of the rotor revolve, an entranceport, andan exit-port connecting with said annular space and the area of which is less than the radial cross-sectional area of said annular space.

4, A rotary pump comprising a casing containing the pump-chamber having a completely circular internal periphery, an entrance-port and a peripheral inclining exitport, and a light and slender radially-bladed rotor revolubly supported in the chamber to generate by revolving therein radial pressure of the fiuid against which the blade operates and extending short of said periphto--iorm therewith about the circle in er wb'ich the tip-extremity of the blade revolves, an annular space for fluid exposed to said radial pressure. r

5. A rotary `pump comprising a casing containing the pump-chamber having a completely circular internal' periphery, 4a

`central entrance-port and peripheral inclin ing` exit-port enlarging outwardly from. an innerthroat-section, a central shaft, and a lradially bladed rotor in the casingon the shaft operating to generate radial pressure of the fluid which it revolves and extending short of said periphery to form therewith about the/circle in which the tip-extremity of the rotor revolves an annular space for fluid exposed to said radial pressure.'

6. A rotary pump comprising a casing containing the pump-chamber having a completely circular internal periphery, an entrance-port and a peripheral exit-port, and

a rotor having radially-extending l`resilient blades and revolubly supported in the chamber to generate by revolving therein radial pressure of the fluidagainst which the blades operate vand forming with said periphery` about the circle in which the ti -extremities of the blades revolve an annu ar space for fluid exposed to said radial pressure.

7. A rotary pump comprising a casing containing the pump-chamber having a completely circular internal periphery, an intake-port and a peripheral inclining exitport enlarging outwardly from an inner throat-section, a rotor having a blade formed of resilient laminated" metal sheets, the rotor being revolubly supported in the chamber to generate by revolving therein radial pressure of the Huid against which the blade operates and the blade forming with said periphery about the circle in which its tip-extremity revolves an annular space for fiuidexposed to said radial pressure. i' 8. In a rotary' pump, a rotor rotatably supported in the pump-chamber and provided with resilient blades extending from cthe. rotor-hub, the length of each blade being shorter 'in its section extendlng from pump-chamber.

JOSEPH SCHNEIBLE. In presence .of-

A. C. FISCHER, O. C. AvIsUs'.

ltions in the 

